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Acid Rain 酸雨

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Acid Rain 酸雨
What is true of Acid Rain?
About pollution
Acid Rain 酸雨
你说的True 具体指什么呢 是酸雨的定义还是形成?
定义:Acid rain means the rain that below pH value 5.6 .
形成:Acid rain is mainly causes by sulphur dioxide and nitrogen oxide.
These kinds of gases are produced by factories and vehicles.
不知道合不合适,希望能帮你哈 xd